441. There are no irregularities in the inflection of in-stems

a. There are no irregularities in the inflection ofin-stems, in either the earlier language or the later — except the usual Vedic dual ending ināinstead ofāu.

b. Stems ininexchange with stems inithroughout the whole history of the language, those of the one class being developed out of those of the other often through transitional forms. In a much smaller number of cases, stems ininare expanded to stems inina: e.g.çākiná(RV.),çuṣmiṇa(B.),barhiṇa,bhajina.